First - WoW Exploit Community 2012 recommendations!
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1. Grab a Savory Deviate Delight, something similar would also probably work.
2. Do the quest chain Need to Know which leads to The Perfect Dissemblance (Dragonblight).
3. Use the quest item on a raven priest which will grant you a raven priest costume.
4. Eat the savory deviate delight.
You will turn invisible, only a shadow on the ground will remain.